ImageMagick not authorized to convert PDF to an image

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emcconville is correct. More specifically edit the Imagemagick policy.xml file to uncomment this line:

  <!-- <policy domain="module" rights="none" pattern="{PS,PDF,XPS}" /> -->

And change it from rights=”none” to rights=”read|write”

  <policy domain="module" rights="read|write" pattern="{PS,PDF,XPS}" />

This was a recent addition to the policy.xml file, I believe, due to a security flaw found in the Ghostscript delegate. I think that flaw has now been fixed in the current version of Ghostscript, which is 9.25.

NOTE: On some systems the policy line will have domain=”coder” rather than domain=”module”

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